在CentOS上部署多節點Citus集羣

1 在全部節點執行如下步驟

Step 01 添加Citus Repostory

# Add Citus repository for package manager
curl https://install.citusdata.com/community/rpm.sh | sudo bash

Step 02 安裝Citus而且初始化DB

# install PostgreSQL with Citus extension
sudo yum install -y citus72_10
# initialize system database (using RHEL 6 vs 7 method as necessary)
sudo service postgresql-10 initdb || sudo /usr/pgsql-10/bin/postgresql-10-setup initdb
# preload citus extension
echo "shared_preload_libraries = 'citus'" | sudo tee -a /var/lib/pgsql/10/data/postgresql.conf

Step 03 配置postgresql.conf

sudo vi /var/lib/pgsql/10/data/postgresql.conf

# Uncomment listen_addresses for the changes to take effect
listen_addresses = '*'

Step 04 配置pg_hba.conf

sudo vi /var/lib/pgsql/10/data/pg_hba.conf

local   all             all                                          peer      
local   replication     all                                          peer
host    all             all             192.168.99.1/24              trust
host    all             all             0.0.0.0/0                    md5

Step 05 配置防火牆

　　查看

firewall-cmd --zone=public --query-port=5432/tcp

　　添加5432端口（--permanent永久生效，沒有此參數重啓後失效）

firewall-cmd --zone=public --add-port=5432/tcp --permanent

　　從新載入

firewall-cmd --reload

Step 06 啓動服務

# start the db server
sudo service postgresql-10 restart
# and make it start automatically when computer does
sudo chkconfig postgresql-10 on

Step 07 給須要的數據庫安裝Citus擴展

sudo -i -u postgres psql -c "CREATE EXTENSION citus;"

Step 08 設置密碼

postgres=# \password postgres          #給postgres用戶設置密碼
Enter new password: 
Enter it again: 

2 在coordinator節點額外執行如下步驟

Step 01 添加worker節點信息

　　添加worker節點的IP地址（或者DNS名稱）和端口號到pg_dist_node表。

sudo -i -u postgres psql -c "SELECT * from master_add_node('192.168.99.101', 5432);"
sudo -i -u postgres psql -c "SELECT * from master_add_node('192.168.99.102', 5432);"

Step 02 驗證安裝是否成功

sudo -i -u postgres psql -c "SELECT * FROM master_get_active_worker_nodes();"

Step 03 開始使用

sudo -i -u postgres psql

 參考資料：

　　https://docs.citusdata.com/en/v7.2/installation/production_rhel.html